Originally Posted by trust0me

First time TAP here too and it's funny system they have .
They say I can do the online check-in 36H before departure time but it didn't let me but only 24H before.
and same situation with the seat assignment. It automatically assigned me and my flying companion middle seats but when I changed them to side two seats together (same row as auto assigned seats) it asked me to pay for $100. I will try again 3H before departure and see how it goes.